From b681a1c73e15e08c70c10cccd9c9f5b65cca12e8 Mon Sep 17 00:00:00 2001 From: Benoît Canet Date: Fri, 26 Jul 2013 22:39:22 +0200 Subject: block: Repair the throttling code. The throttling code was segfaulting since commit 02ffb504485f0920cfc75a0982a602f824a9a4f4 because some qemu_co_queue_next caller does not run in a coroutine. qemu_co_queue_do_restart assume that the caller is a coroutinne. As suggested by Stefan fix this by entering the coroutine directly. Also make sure like suggested that qemu_co_queue_next() and qemu_co_queue_restart_all() can be called only in coroutines. Signed-off-by: Benoit Canet Signed-off-by: Stefan Hajnoczi --- include/block/coroutine.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/block/coroutine.h b/include/block/coroutine.h index 377805a3b0..1f2db3e8a4 100644 --- a/include/block/coroutine.h +++ b/include/block/coroutine.h @@ -130,12 +130,17 @@ void coroutine_fn qemu_co_queue_wait_insert_head(CoQueue *queue); * * Returns true if a coroutine was restarted, false if the queue is empty. */ -bool qemu_co_queue_next(CoQueue *queue); +bool coroutine_fn qemu_co_queue_next(CoQueue *queue); /** * Restarts all coroutines in the CoQueue and leaves the queue empty. */ -void qemu_co_queue_restart_all(CoQueue *queue); +void coroutine_fn qemu_co_queue_restart_all(CoQueue *queue); + +/** + * Enter the next coroutine in the queue + */ +bool qemu_co_enter_next(CoQueue *queue); /** * Checks if the CoQueue is empty. -- cgit v1.2.3-55-g7522 From 02edd2e7665bceb307bedd8afe625c0f7e8d7cfa Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Mon, 29 Jul 2013 15:01:58 +0200 Subject: migration: fix spice migration Commit 29ae8a4133082e16970c9d4be09f4b6a15034617 ("rdma: introduce MIG_STATE_NONE and change MIG_STATE_SETUP state transition") changed the state transitions during migration setup. Spice used to be notified with MIG_STATE_ACTIVE and it detected this using migration_is_active(). Spice is now notified with MIG_STATE_SETUP and migration_is_active() no longer works. Replace migration_is_active() with migration_in_setup() to fix spice migration. Cc: Michael R. Hines Reviewed-by: Kevin Wolf Signed-off-by: Stefan Hajnoczi --- include/migration/migration.h | 2 +- migration.c | 4 ++-- ui/spice-core.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) (limited to 'include') diff --git a/include/migration/migration.h b/include/migration/migration.h index 08c772d4dc..140e6b471c 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -90,7 +90,7 @@ int migrate_fd_close(MigrationState *s); void add_migration_state_change_notifier(Notifier *notify); void remove_migration_state_change_notifier(Notifier *notify); -bool migration_is_active(MigrationState *); +bool migration_in_setup(MigrationState *); bool migration_has_finished(MigrationState *); bool migration_has_failed(MigrationState *); MigrationState *migrate_get_current(void); diff --git a/migration.c b/migration.c index a5ed26b0ba..9fc72943fb 100644 --- a/migration.c +++ b/migration.c @@ -338,9 +338,9 @@ void remove_migration_state_change_notifier(Notifier *notify) notifier_remove(notify); } -bool migration_is_active(MigrationState *s) +bool migration_in_setup(MigrationState *s) { - return s->state == MIG_STATE_ACTIVE; + return s->state == MIG_STATE_SETUP; } bool migration_has_finished(MigrationState *s) diff --git a/ui/spice-core.c b/ui/spice-core.c index f308fd9d5e..033fd8925b 100644 --- a/ui/spice-core.c +++ b/ui/spice-core.c @@ -563,7 +563,7 @@ static void migration_state_notifier(Notifier *notifier, void *data) { MigrationState *s = data; - if (migration_is_active(s)) { + if (migration_in_setup(s)) { spice_server_migrate_start(spice_server); } else if (migration_has_finished(s)) { spice_server_migrate_end(spice_server, true); -- cgit v1.2.3-55-g7522 From 84db52d059f3296abf7783968645c4a96d21b099 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Mon, 29 Jul 2013 15:01:59 +0200 Subject: dataplane: enable virtio-blk x-data-plane=on live migration Although the dataplane thread does not cooperate with dirty memory logging yet it's fairly easy to temporarily disable dataplane during live migration. This way virtio-blk can live migrate when x-data-plane=on. The dataplane thread will restart after migration is cancelled or if the guest resuming virtio-blk operation after migration completes. Reviewed-by: Kevin Wolf Signed-off-by: Stefan Hajnoczi --- hw/block/dataplane/virtio-blk.c | 9 --------- hw/block/virtio-blk.c | 32 ++++++++++++++++++++++++++++++++ include/hw/virtio/virtio-blk.h | 1 + 3 files changed, 33 insertions(+), 9 deletions(-) (limited to 'include') diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c index 2faed43127..63c3ffabc1 100644 --- a/hw/block/dataplane/virtio-blk.c +++ b/hw/block/dataplane/virtio-blk.c @@ -18,7 +18,6 @@ #include "qemu/error-report.h" #include "hw/virtio/dataplane/vring.h" #include "ioq.h" -#include "migration/migration.h" #include "block/block.h" #include "hw/virtio/virtio-blk.h" #include "virtio-blk.h" @@ -69,8 +68,6 @@ struct VirtIOBlockDataPlane { queue */ unsigned int num_reqs; - - Error *migration_blocker; }; /* Raise an interrupt to signal guest, if necessary */ @@ -433,10 +430,6 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk, /* Prevent block operations that conflict with data plane thread */ bdrv_set_in_use(blk->conf.bs, 1); - error_setg(&s->migration_blocker, - "x-data-plane does not support migration"); - migrate_add_blocker(s->migration_blocker); - *dataplane = s; return true; } @@ -448,8 +441,6 @@ void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s) } virtio_blk_data_plane_stop(s); - migrate_del_blocker(s->migration_blocker); - error_free(s->migration_blocker); bdrv_set_in_use(s->blk->conf.bs, 0); g_free(s); } diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index cf12469b50..1237b6acd3 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -19,6 +19,7 @@ #include "hw/virtio/virtio-blk.h" #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE # include "dataplane/virtio-blk.h" +# include "migration/migration.h" #endif #include "block/scsi.h" #ifdef __linux__ @@ -628,6 +629,34 @@ void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk) memcpy(&(s->blk), blk, sizeof(struct VirtIOBlkConf)); } +#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE +/* Disable dataplane thread during live migration since it does not + * update the dirty memory bitmap yet. + */ +static void virtio_blk_migration_state_changed(Notifier *notifier, void *data) +{ + VirtIOBlock *s = container_of(notifier, VirtIOBlock, + migration_state_notifier); + MigrationState *mig = data; + + if (migration_in_setup(mig)) { + if (!s->dataplane) { + return; + } + virtio_blk_data_plane_destroy(s->dataplane); + s->dataplane = NULL; + } else if (migration_has_finished(mig) || + migration_has_failed(mig)) { + if (s->dataplane) { + return; + } + bdrv_drain_all(); /* complete in-flight non-dataplane requests */ + virtio_blk_data_plane_create(VIRTIO_DEVICE(s), &s->blk, + &s->dataplane); + } +} +#endif /* CONFIG_VIRTIO_BLK_DATA_PLANE */ + static int virtio_blk_device_init(VirtIODevice *vdev) { DeviceState *qdev = DEVICE(vdev); @@ -664,6 +693,8 @@ static int virtio_blk_device_init(VirtIODevice *vdev) virtio_cleanup(vdev); return -1; } + s->migration_state_notifier.notify = virtio_blk_migration_state_changed; + add_migration_state_change_notifier(&s->migration_state_notifier); #endif s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); @@ -683,6 +714,7 @@ static int virtio_blk_device_exit(DeviceState *dev) VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIOBlock *s = VIRTIO_BLK(dev); #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE + remove_migration_state_change_notifier(&s->migration_state_notifier); virtio_blk_data_plane_destroy(s->dataplane); s->dataplane = NULL; #endif diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index fc71853eb4..b87cf490b1 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -125,6 +125,7 @@ typedef struct VirtIOBlock { unsigned short sector_mask; VMChangeStateEntry *change; #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE + Notifier migration_state_notifier; struct VirtIOBlockDataPlane *dataplane; #endif } VirtIOBlock; -- cgit v1.2.3-55-g7522